1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 ; Remove an icmp by using its operand in the subsequent logic directly.
6 define i8 @zext_or_icmp_icmp(i8 %a, i8 %b) {
7 ; CHECK-LABEL: @zext_or_icmp_icmp(
8 ; CHECK-NEXT: [[MASK:%.*]] = and i8 [[A:%.*]], 1
9 ; CHECK-NEXT: [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0
10 ; CHECK-NEXT: [[TOBOOL22:%.*]] = zext i1 [[TOBOOL2]] to i8
11 ; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[MASK]], 1
12 ; CHECK-NEXT: [[ZEXT3:%.*]] = or i8 [[TMP1]], [[TOBOOL22]]
13 ; CHECK-NEXT: ret i8 [[ZEXT3]]
16 %toBool1 = icmp eq i8 %mask, 0
17 %toBool2 = icmp eq i8 %b, 0
18 %bothCond = or i1 %toBool1, %toBool2
19 %zext = zext i1 %bothCond to i8
23 define i8 @zext_or_icmp_icmp_logical(i8 %a, i8 %b) {
24 ; CHECK-LABEL: @zext_or_icmp_icmp_logical(
25 ; CHECK-NEXT: [[MASK:%.*]] = and i8 [[A:%.*]], 1
26 ; CHECK-NEXT: [[TOBOOL1:%.*]] = icmp eq i8 [[MASK]], 0
27 ; CHECK-NEXT: [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0
28 ; CHECK-NEXT: [[BOTHCOND:%.*]] = select i1 [[TOBOOL1]], i1 true, i1 [[TOBOOL2]]
29 ; CHECK-NEXT: [[ZEXT:%.*]] = zext i1 [[BOTHCOND]] to i8
30 ; CHECK-NEXT: ret i8 [[ZEXT]]
33 %toBool1 = icmp eq i8 %mask, 0
34 %toBool2 = icmp eq i8 %b, 0
35 %bothCond = select i1 %toBool1, i1 true, i1 %toBool2
36 %zext = zext i1 %bothCond to i8
40 ; Here, widening the or from i1 to i32 and removing one of the icmps would
41 ; widen an undef value (created by the out-of-range shift), increasing the
42 ; range of valid values for the return, so we can't do it.
44 define i32 @dont_widen_undef() {
45 ; CHECK-LABEL: @dont_widen_undef(
47 ; CHECK-NEXT: br label [[BLOCK2:%.*]]
49 ; CHECK-NEXT: br label [[BLOCK2]]
51 ; CHECK-NEXT: [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ]
52 ; CHECK-NEXT: [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ]
53 ; CHECK-NEXT: [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]]
54 ; CHECK-NEXT: [[CONV2:%.*]] = zext i1 [[CMP1]] to i32
55 ; CHECK-NEXT: ret i32 [[CONV2]]
64 %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ]
65 %cmp.i = icmp ugt i32 %m.011, 1
66 %m.1.op = lshr i32 1, %m.011
67 %sext.mask = and i32 %m.1.op, 65535
68 %cmp115 = icmp ne i32 %sext.mask, 0
69 %cmp1 = or i1 %cmp.i, %cmp115
70 %conv2 = zext i1 %cmp1 to i32
74 define i32 @dont_widen_undef_logical() {
75 ; CHECK-LABEL: @dont_widen_undef_logical(
77 ; CHECK-NEXT: br label [[BLOCK2:%.*]]
79 ; CHECK-NEXT: br label [[BLOCK2]]
81 ; CHECK-NEXT: [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ]
82 ; CHECK-NEXT: [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ]
83 ; CHECK-NEXT: [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]]
84 ; CHECK-NEXT: [[CONV2:%.*]] = zext i1 [[CMP1]] to i32
85 ; CHECK-NEXT: ret i32 [[CONV2]]
94 %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ]
95 %cmp.i = icmp ugt i32 %m.011, 1
96 %m.1.op = lshr i32 1, %m.011
97 %sext.mask = and i32 %m.1.op, 65535
98 %cmp115 = icmp ne i32 %sext.mask, 0
99 %cmp1 = select i1 %cmp.i, i1 true, i1 %cmp115
100 %conv2 = zext i1 %cmp1 to i32
104 ; This should not end with more instructions than it started from.
106 define i32 @PR49475(i32 %x, i16 %y) {
107 ; CHECK-LABEL: @PR49475(
108 ; CHECK-NEXT: [[M:%.*]] = and i16 [[Y:%.*]], 1
109 ; CHECK-NEXT: [[B1:%.*]] = icmp eq i32 [[X:%.*]], 0
110 ; CHECK-NEXT: [[B2:%.*]] = icmp eq i16 [[M]], 0
111 ; CHECK-NEXT: [[T1:%.*]] = or i1 [[B1]], [[B2]]
112 ; CHECK-NEXT: [[Z:%.*]] = zext i1 [[T1]] to i32
113 ; CHECK-NEXT: ret i32 [[Z]]
116 %b1 = icmp eq i32 %x, 0
117 %b2 = icmp eq i16 %m, 0
119 %z = zext i1 %t1 to i32
123 ; This would infinite-loop.
125 define i8 @PR49475_infloop(i32 %t0, i16 %insert, i64 %e, i8 %i162) {
126 ; CHECK-LABEL: @PR49475_infloop(
127 ; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[T0:%.*]], 0
128 ; CHECK-NEXT: [[B2:%.*]] = icmp eq i16 [[INSERT:%.*]], 0
129 ; CHECK-NEXT: [[T1:%.*]] = or i1 [[B]], [[B2]]
130 ; CHECK-NEXT: [[EXT:%.*]] = zext i1 [[T1]] to i32
131 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[EXT]], [[T0]]
132 ; CHECK-NEXT: [[TMP1:%.*]] = or i32 [[AND]], 140
133 ; CHECK-NEXT: [[XOR1:%.*]] = zext i32 [[TMP1]] to i64
134 ; CHECK-NEXT: [[CONV16:%.*]] = sext i8 [[I162:%.*]] to i64
135 ; CHECK-NEXT: [[SUB17:%.*]] = sub i64 [[CONV16]], [[E:%.*]]
136 ; CHECK-NEXT: [[SEXT:%.*]] = shl i64 [[SUB17]], 32
137 ; CHECK-NEXT: [[CONV18:%.*]] = ashr exact i64 [[SEXT]], 32
138 ; CHECK-NEXT: [[CMP:%.*]] = icmp sle i64 [[CONV18]], [[XOR1]]
139 ; CHECK-NEXT: [[CONV19:%.*]] = zext i1 [[CMP]] to i16
140 ; CHECK-NEXT: [[OR21:%.*]] = or i16 [[CONV19]], [[INSERT]]
141 ; CHECK-NEXT: [[TRUNC44:%.*]] = trunc i16 [[OR21]] to i8
142 ; CHECK-NEXT: [[INC:%.*]] = or i8 [[TRUNC44]], [[I162]]
143 ; CHECK-NEXT: [[TOBOOL23_NOT:%.*]] = icmp eq i16 [[OR21]], 0
144 ; CHECK-NEXT: call void @llvm.assume(i1 [[TOBOOL23_NOT]])
145 ; CHECK-NEXT: ret i8 [[INC]]
147 %b = icmp eq i32 %t0, 0
148 %b2 = icmp eq i16 %insert, 0
150 %ext = zext i1 %t1 to i32
151 %and = and i32 %t0, %ext
152 %conv13 = zext i32 %and to i64
153 %xor = xor i64 %conv13, 140
154 %conv16 = sext i8 %i162 to i64
155 %sub17 = sub i64 %conv16, %e
156 %sext = shl i64 %sub17, 32
157 %conv18 = ashr exact i64 %sext, 32
158 %cmp = icmp sge i64 %xor, %conv18
159 %conv19 = zext i1 %cmp to i16
160 %or21 = or i16 %insert, %conv19
161 %trunc44 = trunc i16 %or21 to i8
162 %inc = add i8 %i162, %trunc44
163 %tobool23.not = icmp eq i16 %or21, 0
164 call void @llvm.assume(i1 %tobool23.not)
168 declare void @llvm.assume(i1 noundef)